Technical description and composition of the MYSTERY MTV-3012W TV, panel type and applicable modules. The composition of the modules.MYSTERY LED
Model: MTV-3012W
Chassis / Version: 40-0MS82D-MAD2LG
Panel: V290BJ1-L01 Rev. C1
LED driver (backlight): integrated into PSU
PWM LED driver: OZ9976
Power Supply (PSU): PLC80P
PWM Power: FAN7930C, OB2283B
MOSFET Power: TK12A50D
MainBoard: 40-0MS82D-MAD2LG
IC MainBoard: CPU: MST6M182VG-LF-Z1, SPI Flash: 25Q32B;
Tuner: XF-3SA
Technical Specifications MTV-3012W
MYSTERY MTV-3012W
General repair guidelines for TV LCD LED
Possible manifestations of defects
- The MYSTERY MTV-3012W TV does not turn on, does not respond to the remote control and buttons on the control panel, does not light up or blink indicators.
Most often, with such manifestations, the PLC80P main power module turns out to be faulty. It is necessary to measure its output voltages, and in case of their absence (full or partial), it is necessary to check the serviceability of power switches (TK12A50D) of converters and rectifier diodes for the presence of a possible short circuit.
In case of any breakdown of semiconductors in the secondary circuits, the converter can usually work normally in emergency short circuit mode. There are no output voltages. And with a short circuit in the power elements of the primary circuit, as a rule, the mains fuse breaks and less often the current sensor at the source of the key.
The breakdown of Mos-Fet keys used in pulsed sources is often caused by malfunctions of other elements, for example, in the power supply circuit of a PWM controller, in frequency-setting or damping circuits, as well as in Negative Stabilization Feedback. Chips PWM (PWM) FAN7930C, OB2283B are usually checked by replacing with new, or obviously working.
- There is no image, there is sound, it responds to the remote control, the channels are switched. In some cases, the image appears when you turn on and immediately disappears.
In such cases, the most likely malfunction of the LED backlight elements. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
To check the LED lines for breaks without disassembling the panel, for example, a current source will help. It is impossible to open series-connected PN junctions with a simple multimeter, a voltage of the order of several tens of volts is required.
- The TV does not enter the operating mode, does not respond to the remote control. The indicator on the front panel lights constantly or blinks.
Repair or diagnostics of the 40-0MS82D-MAD2LG motherboard should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, update or replace the software (software). In some cases, chip repair may be required to repair the MB (SSB) board - CPU: MST6M182VG-LF-Z1, SPI Flash: 25Q32B; to new or obviously serviceable. In cases where BGA technologies are used, defects are usually localized by the heating method.
In the absence of tuning to the channels of on-air or cable television, you should make sure that the software is correct, as well as in accordance with the ratings of the supply voltage at the terminals of the XF-3SA tuner. It is also necessary to check the presence of pulses of data exchange between the tuner and the processor via the I2C bus using an oscilloscope.
We recommend the owners of the MTV-3012W TV for repair only to qualified specialists with the necessary work experience! Self-repair attempts without the appropriate knowledge and skills can lead to irreversible negative consequences!
FIRMWARE FOR SPI FLASH -----------> MYSTERY MTV-3012W, Main: 40-0MS82D-MAD2LG, Panel: V290BJ1-L01 Rev.C1
The appearance of the MainBoard 40-0MS82D-MAD2LG is shown in the figure below:40-0MS82D-MAD2LG
40-0MS82D-MAD2LG can be used in TVs:
MYSTERY MTV-3012W (Panel V290BJ1-L01 Rev.C1 ), TCL 29T2100 (Panel V290BJ1-LE1 Rev.C1), TCL 29B340 (Panel V290BJ1-L01).
The appearance of the power supply
Main features of the MYSTERY MTV-3012W device:
Installed matrix (LED-panel) V290BJ1-L01 Rev. C1.
To power the backlight LEDs, a converter is used, combined with a power supply, controlled by the OZ9976 PWM controller.
The required supply voltages for all nodes of the MYSTERY MTV-3012W TV are generated by the PLC80P power module or its analogs using FAN7930C, OB2283B microcircuits and TK12A50D type power switches.
MainBoard - the main board (motherboard) is a 40-0MS82D-MAD2LG module, using CPU chips: MST6M182VG-LF-Z1, SPI Flash: 25Q32B; and others.
The XF-3SA tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: CMO
Model: V290BJ1-L01
Type: a-Si TFT-LCD, Panel
Diagonal size: 29.0 inch
Resolution: 1366x768, WXGA
Display Mode: Super MVA, Normally Black, Transmissive
Active Area: 631.092x354.816 mm
Surface: Antiglare (Haze 3.5%)
Brightness: 300 cd / m²
Contrast Ratio: 2500: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 8.5 (G to G)
Frequency: 60Hz
Lamp Type: 3 pcs CCFL Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
MYSTERY MTV-3012W TV with V290BJ1-L01 LCD, 29 "(74 cm) diagonal, 16: 9 format. 300 cd / m² screen brightness is provided by CCFL (EEFL) fluorescent lamps. Dynamic contrast ratio 4000: 1 is provided by special control of the backlight operation depending on the illumination of areas in the plot. You can view images in high quality HD at a resolution of 1366x768 pixels in the standard of graphic decomposition 720p (HD Ready). The input high-frequency or video signal can be processed in analog systems PAL, SECAM, NTSC. Graphic image elaboration and formation of the digital signal is in 480i standards, 480p, 576i, 576p, 720p, 1080i Supported multimedia file formats:. MP3, WMA, MPEG4, Xvid, MKV, JPEG.
The power of the sound system 10 W (2x5 W) provides two speakers. The audio processing system NICAM STEREO is used.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, component, VGA, HDMI, USB. To connect a computer or laptop to this TV model, a VGA (D-Sub 15) connector is used on the TV case, this interface supports resolutions: 640x480, 800x600, 1024x768, 1360x768.
The power consumed by the TV in the operating mode from the network is 80 watts.
Dimensions: With stand 642x444x209 mm, Without stand 570x345x70 mm.
Attention! The MYSTERY MTV-3012W LCD TV panel V290BJ1-L01 Rev. C1 is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen to avoid permanent damage to the LCD panel!